Cyclospora Infection Outbreak Across the U.S.
Health officials are examining a rise in cyclospora cases, a foodborne illness that leads to severe diarrhea spreading across the United States. Several states are experiencing outbreaks, including Michigan, which has reported an especially high number. Typically, the illness arises from the parasite Cyclospora cayetanensis.
Characteristics and Spread
The disease often results in watery diarrhea, sometimes called “explosive” due to its intensity. In the past, such outbreaks have been linked to fresh produce contaminated by the parasite, with cases usually increasing during the summer months.
“The chances of contracting cyclosporiasis rise as temperatures increase,” state health experts remark.
States Reporting Cases
According to recent data from the CDC and state health departments, confirmed cases have been identified in multiple states, such as Alaska, Colorado, Connecticut, Florida, Georgia, Illinois, Louisiana, Massachusetts, Michigan, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Texas, Virginia, and Wisconsin. Michigan has seen the largest outbreak, with more than 700 confirmed cases. Ohio follows with 177, and other states are investigating smaller clusters.
CDC and Current Statistics
The CDC reports that cases of cyclosporiasis usually rise from May 1 to August 31. The latest surveillance update noted 145 cases acquired domestically from May 1 to June 16, with 20 hospitalizations and no deaths. These numbers may underestimate the real situation, as national surveillance is updated with a delay.
The CDC emphasizes that not all illnesses are linked to a single outbreak, with investigations underway to identify any shared food sources among clusters.
Underreporting Issues
Public health officials suggest that many infections go unreported due to a lack of lab testing or medical attention. Also, delays from exposure to symptom onset affect accurate data collection.
Previously Linked Foods
No specific food has been linked to the current outbreaks, but past U.S. cases have been associated with basil, cilantro, mesclun lettuce, bagged salad mixes, raspberries, snow peas, and green onions. Contamination often occurs before these foods reach the consumer.
Symptoms of Infection
- Watery diarrhea
- Frequent, sometimes severe, diarrhea
- Stomach cramps
- Bloating
- Nausea
- Loss of appetite
- Fatigue
- Weight loss
Symptoms appear approximately one week after consuming contaminated food or water but may present in as little as two days or up to two weeks post-exposure. Without treatment, symptoms can last several weeks and may temporarily recede, only to return.
Current Actions and Future Expectations
The FDA, CDC, and state health departments are actively investigating to pinpoint the contamination source. No specific grower or supplier has yet been identified. As cyclospora infections have a seasonal pattern and are affected by reporting delays, more cases are anticipated in the coming weeks. Investigators aim to determine if multiple contamination events are to blame, rather than a single national outbreak.